CDC 2A652 Vol. 4
Aerospace Ground Equipment Journeyman Common AGE Systems. Edit Code 05.
- 1.What component on the New Generation Heater activates the HCU?
- A.
Oil pressure switch.
- B.
Burner control unit.
- C.
Heat control switch.
- D.
Thermostatic sensor.
- 2.The HCU on the New Generation heater starts the main air fan for output air when
- A.
A heat setting is selected.
- B.
Constant flame is established.
- C.
The temperature gauge reads cool.
- D.
The inside temperature reaches 140 degrees F.
- 3.When should you use starting aids to start the New Generation Heater?
- A.
During the engine start up with the ignition switch in PREHEAT position.
- B.
Never, as it will result in serious engine damage.
- C.
When the temperature gauge reads COOL.
- D.
When ambient temperature is below 32 degrees F.
- 4.Repair of ground heater equipment should never be attempted
- A.
Without first talking with the operator.
- B.
Without first consulting your supervisor.
- C.
Unless accurate technical data is available.
- D.
Unless in the presence of an experienced mechanic.
- 5.The amount of heat required to raise the temperature of one pound of a substance on degree Fahrenheit is known as
- A.
British thermal unit.
- B.
Sensible unit.
- C.
Specific heat.
- D.
Latent heat.
- 6.Heat that can be felt and added or subtracted to a substance without changing its state is called
- A.
Super heat.
- B.
Latent heat.
- C.
Specific heat.
- D.
Sensible heat.
- 7.Heat added to a gaseous substance is known as
- A.
Sensible heat.
- B.
Specific heat.
- C.
Super heat.
- D.
Latent heat.
- 8.The relationship between pressure and the boiling point of a liquid is seen when
- A.
Pressure increases, it raises the boiling point.
- B.
Pressure increases, it lowers the boiling point.
- C.
The boiling point increases, it raises the pressure.
- D.
The boiling point increases, it lowers the pressure.
- 9.The factors that have the greatest bearing on the temperature of a refrigerant are the boiling of a liquid and the amount of heat applied and the
- A.
Temperature of the vapor.
- B.
Type of heat transfer.
- C.
Moisture in the air.
- D.
Pressure applied.
- 10.What component on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit?
- A.
Blower control switch.
- B.
Airflow control switch.
- C.
Evaporator control switch.
- D.
Temperature control switch.
- 11.What type of solution is used in the MA-3D aftercooler system to carry heat away from the conditioned air stream?
- A.
Liquid refrigerant.
- B.
Gaseous refrigerant.
- C.
Pure water solution.
- D.
Ethylene glycol/water solution.
- 12.Refrigerant that leaves the evaporator coil in the MA-3D air conditioner is further changed into a
- A.
Low pressure gas.
- B.
High pressure gas.
- C.
Low pressure liquid.
- D.
High pressure liquid.
- 13.After the refrigerant leaves the compressor on the MA-3D air conditioner, it passes through the oil separator and into the
- A.
Heatsink coils.
- B.
Condenser coils.
- C.
Evaporator coils.
- D.
Receiver inlet valve.
- 14.When starting the MA-3D air conditioner, hold the safety override switch until
- A.
30 psi oil pressure is registered on the engine oil pressure gauge.
- B.
You release the start switch.
- C.
The engine warms up.
- D.
The engine starts.
- 15.What component on the MA-3D air conditioner receives input from sensors for suction pressure and leaving air temperature?
- A.
Air cooler fan.
- B.
Air volume controller.
- C.
Temperature controller.
- D.
Temperature control knob.
- 16.What component on the MA-3D air conditioner shuts off the compressor when the suction pressure drops below 5 psi?
- A.
Low pressure cutout.
- B.
High pressure cutout.
- C.
Temperature controller.
- D.
Temperature control switch.
- 17.What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
- A.
Inward leaks.
- B.
Vacuum leaks.
- C.
Pressure leaks.
- D.
Outward leaks.
- 18.When performing refrigerant recovery, be sure
- A.
To use vacuum pumps.
- B.
To use the HCU.
- C.
The output air is between 150°F – 185°F.
- D.
The refrigerant has become a low-pressure vapor for compressor use.
- 19.The air cycle machine of an A/M32C–10D air conditioner consists of
- A.
A air compressor fan only.
- B.
An expansion turbine only.
- C.
A heat exchanger and an expansion turbine.
- D.
An expansion turbine and a compressor fan.
- 20.The component of a A/M32C–10D air conditioner that extracts energy from the bleed air on the air cycle machine is the
- A.
Compressor.
- B.
Heat exchanger.
- C.
Expansion turbine.
- D.
Temperature controller.
- 21.The compressor switch on the ACE 802S must be held in the HOLD position when engaging the compressor in order to
- A.
Ensure the engine is at governed speed before engaging compressor.
- B.
Allow the oil and discharge pressures to stabilize.
- C.
Defrost the evaporator.
- D.
Build-up oil pressure.
- 22.What action occurs in the evaporator of the ACE 802S air conditioner?
- A.
Condensing refrigerant absorbs heat from the air stream.
- B.
Boiling refrigerant absorbs heat from the air stream.
- C.
Condensing refrigerant looses heat to the air stream.
- D.
Boiling refrigerant looses heat to the air stream.
- 23.What system on the ACE 802S air conditioner “supercharges” the compressor?
- A.
Defrost.
- B.
Heat boost.
- C.
Vapor injection.
- D.
Liquid injection.
- 24.What valve must be opened prior to starting the engine on the ACE 802S?
- A.
Air shutoff.
- B.
Fuel shutoff.
- C.
Coolant control.
- D.
Refrigerant flow.
- 25.What must be accomplished to avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation?
- A.
Permit refrigerant pressure to equalize.
- B.
Perform maximum refrigerant pump down.
- C.
Place heating/cooling switch in HEATING position.
- D.
Place the reversing valve lever in the HEATING position.
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